<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>登记新书</title>

    <!-- Bootstrap -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
          integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">

    <!-- HTML5 shim 和 Respond.js 是为了让 IE8 支持 HTML5 元素和媒体查询（media queries）功能 -->
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    <script src="https://cdn.jsdelivr.net/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/respond.js@1.4.2/dest/respond.min.js"></script>
    <![endif]-->
    <script>
        function openFolder() {
            document.getElementById("image").click();
        }

        function CompareDate(d1, d2) {
            return ((new Date(d1.replace(/-/g, "\/"))) > (new Date(d2.replace(/-/g, "\/"))));
        }

        function register() {
            let bookName = document.getElementById("bookName").value;
            if (!bookName) {
                alert("请输入图书名称");
                return false;
            }
            let authorName = document.getElementById("author").value;
            if (!authorName) {
                alert("请输入作者名");
                return false;
            }
            let pressName = document.getElementById("press").value;
            if (!pressName) {
                alert("请输入出版社名");
                return false;
            }
            let publicDate = document.getElementById("publicDate").value;
            if (!publicDate) {
                alert("请输入正确的出版日期");
                return false;
            }
            let date = new Date();
            date = date.getFullYear() + '-' + (date.getMonth() + 1) + '-' + date.getDate();
            if (CompareDate(publicDate, date)) {
                alert("出版日期不能晚于当前日期");
                return false;
            }
            let surplus = document.getElementById("surplus").value;
            if (!surplus) {
                alert("请输入库存数量");
                return false;
            } else if (surplus < 0 || String(surplus).indexOf('.') > 0) {
                alert("库存数量应为非负整数");
                return false;
            }
            let image = document.getElementById("image").value;
            if (!image) {
                alert("请上传封面图片");
                return false;
            }
            alert("登记新书成功");
            return true;
        }

        function getFileName() {
            let fileName = document.getElementById("image").files[0].name;
            document.getElementById("fileName").innerHTML = fileName;
        }
    </script>
</head>

<body style="background: url(/background.jpeg); background-size: cover">

<div class="modal-dialog" style="margin-top: 5%;opacity: 85%">
    <div class="modal-content" style="margin:auto;width: 400px;height: 400px">
        <form class="form-inline" onsubmit="return register()" action="/register" method="post"
              style="margin-left: 10%;margin-top: 10%">
            <table style="border-spacing: 10px;border-collapse: separate">
                <tr>
                    <td>图书名称</td>
                    <td>
                        <input type="text" class="form-control" id="bookName" name="bookName">
                    </td>
                </tr>
                <tr>
                    <td>作者</td>
                    <td>
                        <input type="text" class="form-control" id="author" name="author">
                    </td>
                </tr>
                <tr>
                    <td>出版社</td>
                    <td>
                        <input type="text" class="form-control" id="press" name="press">
                    </td>
                </tr>
                <tr>
                    <td>出版日期</td>
                    <td>
                        <input type="date" class="form-control" id="publicDate" name="publicDate">
                    </td>
                </tr>
                <tr>
                    <td>库存数量</td>
                    <td>
                        <input type="number" min="0" class="form-control" id="surplus" name="surplus">
                    </td>
                </tr>
                <tr>
                    <td>
                        <input type="file" accept="image/*" id="image" style="display: none" onchange="getFileName()">
                        <button type="button" onclick="openFolder()">选择图书封面</button>
                    <td>
                        <div id="fileName"></div>
                    </td>
                </tr>
            </table>
            <button type="submit" style="margin-left: 100px;width: 80px" class="btn-primary">登记新书
            </button>
        </form>
    </div>
</div>

<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
<script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"
        integrity="sha384-nvAa0+6Qg9clwYCGGPpDQLVpLNn0fRaROjHqs13t4Ggj3Ez50XnGQqc/r8MhnRDZ"
        crossorigin="anonymous"></script>
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<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"
        integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd"
        crossorigin="anonymous"></script>
</body>
</html>